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Monday, October 10, 2011

Almost Genius: Spokeless Bike Wheels

Almost Genius: Spokeless Bike Wheels

BY WILLIAM BOSTWICKMon Mar 15, 2010
A wave of spokeless bike designs (more renderings than reality) prompts one question: why?

spokeless bike
Come on, guys: what did spokes ever do to you? It seems like every new bicycle prototypespinning around the blogosphere has one thing in common. Or rather, lacks it: spokes. For some reason, designers hate the things, coming up with one heavily-stylized way after another to do away with hubs and spokes. Some mechanical engineers from Yale even caused a stir last month by actually building one.
spokeless bike
But why? The most common reason is weight: Hubless wheels are supposedly lighter. But considering it's pretty easy to find wheel pairs (with spokes) weighing less than 1.5 kilograms, the claim is dubious. You'd need a pretty powerful rim to hold up under pressure unmediated by a set of spokes, and that's bound to weigh quite a bit. Spokes are near perfect: They put the wheel in tension, like a suspension bridge wrapped in a circle. The concept works so well, wheelbuilders have gotten away with using as few as eight spokes on a wheel--but they're still using spokes. When designers play around with the physics--putting spokes in compression, instead of tension, like Mavic infamously tried with their R-Sys wheels--the results are explosive. Should designers give up on rethinking the bicycle? Not necessarily. But maybe it's time they shift their attention to a different part. A more comfortable seat, say, or better-looking spandex.
spokeless bike
spokeless bike

1 comments:

andy wallen said...

Paul Lew,of Lew composites (turned into Reynolds Wheels) and Lew Racing ($5000+ sub 900g wheelsets) invented the decicedly UCI noncompliant black hole wheel well over 10 years ago.

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